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Black Iron BTU Capacity
RidgeReaper56
Member Posts: 7
Hello everyone,
I am running into an issue where I need to know the BTU capacity of 11/4" SCH40 Black Iron pipe. The pipe is in a hot water heating system. I've been looking for charts online and I can't find what I am looking for. Does anyone here know of any charts, or can provide information for what I am looking for.
Thank you
I am running into an issue where I need to know the BTU capacity of 11/4" SCH40 Black Iron pipe. The pipe is in a hot water heating system. I've been looking for charts online and I can't find what I am looking for. Does anyone here know of any charts, or can provide information for what I am looking for.
Thank you
0
Comments

How many btu are we talking about…?0


Are you able to share your source with me?0


google this
heat loss of 1 1/4" schedule 40 black steel pipe
JakeSteam: The Perfect Fluid for Heating and Some of the Problems
by Jacob (Jake) Myron1 

Thank you all for your help. I was over thinking my Google search.0

This calculator will give you GPM as a function of feet per second.
https://www.tlv.com/global/US/calculator/waterflowratethroughpiping.htmlOften wrong, never in doubt.0 
BTU/Hr = GPM x Delta T x 500 (constant)
Many designers use GPM at 4 ft/sec and a Delta T of 20 degrees.
For "speed math" you can take the pipe capacity at 4 ft/sec and just move the decimal.
16 GPM x 20 X 500 +160,000"If you can't explain it simply, you don't understand it well enough"
Albert Einstein1 
The engineering toolbox has a lot of info for sizing pipes, here is a type L copper example and steel pipe 2" and up.
Pipe size over 2" is sized by pressure drop, not the flow velocity. Pipe under 2" stay at or below 4 fps velocity.
So the table shows max. flow rates, now determine the delta T you will design around to get heat carrying capacity.Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0
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